Twinning and Texture Transitions in Titanium Solid-Solution Alloys.
ARMY MATERIALS AND MECHANICS RESEARCH CENTER WATERTOWN MASS
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The preferred orientation of cold-rolled sheet processed from laboratory heats of several titanium binary alloy series was studied. Titanium-based alloys of iron, manganese, chromium, cobalt, nickel, copper, molybdenum, vanadium, columbium, aluminum, tin, and zirconium were included in the investigation. It was found that additions of beta stabilizers caused a texture transition when the retained beta was in excess of about 16 volume percent. This texture transition, for the basal pole, may be roughly described as an unalloyed titanium to zinc-type transition. Copper was an exception and alloys of this element had a tendency to form an ideal 0001 10-10 type texture similar to that previously found for additions of the alpha stabilizer aluminum. Neutral alloying elements like tine and zirconium were found to have only a small effect upon the texture, merely sharpening the unalloyed type. Little effect of lattice parameters was noticed except for a trent of high ca ratio alloys to produce a component of a stable end orientation of the 11-2010-10 type. A qualitative discussion of how these textures form is included however, due to a lack of complete information about roll-gap stresses and deformation, along with absence of values for critical stresses for slip and twinning in these alloys, it was not possible to be quantitative. Author
- Properties of Metals and Alloys